The gender-bigotry comes from the “what man needs to mark 28 days?” There’s snark behind the comment, and it’s unnecessary. That said, a woman could be just as likely as a man to mark moon phases. But saying “man” doesn’t mean “male” when talking about us as a species from my understanding. Seems like a broader term to use which includes the entirety of the homo-whatevers.
I’m just some guy here and am not educated in this stuff, though!